'use strict';

// Fix back button cache problem
window.onunload = function() {};

// Global variable, shared between modules
function playpen_text(playpen) {
  let code_block = playpen.querySelector('code');

  if (window.ace && code_block.classList.contains('editable')) {
    let editor = window.ace.edit(code_block);
    return editor.getValue();
  } else {
    return code_block.textContent;
  }
}

function remove_default_main(text) {
  var tArr = text.split('\n');
  if (tArr.slice(0, 3).some(t => t.trim() == '#![allow(unused_variables)]')) {
    var mainIndex = 3;
    tArr.forEach((t,i) => {
      if (t.trim() == "fn main() {"){
        mainIndex = i
      }
    })
    return tArr.slice(mainIndex+1, -1).join('\n');
  }
  return text;
}

(function codeSnippets() {
  // Hide Rust code lines prepended with a specific character
  var hiding_character = '#';

  function fetch_with_timeout(url, options, timeout = 6000) {
    return Promise.race([
      fetch(url, options),
      new Promise((_, reject) =>
        setTimeout(() => reject(new Error('timeout')), timeout)
      )
    ]);
  }

  var playpens = Array.from(document.querySelectorAll('.playpen'));
  if (playpens.length > 0) {
    fetch_with_timeout('https://play.rust-lang.org/meta/crates', {
      headers: {
        'Content-Type': 'application/json'
      },
      method: 'POST',
      mode: 'cors'
    })
      .then(response => response.json())
      .then(response => {
        // get list of crates available in the rust playground
        let playground_crates = response.crates.map(item => item['id']);
        playpens.forEach(block =>
          handle_crate_list_update(block, playground_crates)
        );
      });
  }

  function handle_crate_list_update(playpen_block, playground_crates) {
    // update the play buttons after receiving the response
    update_play_button(playpen_block, playground_crates);

    // and install on change listener to dynamically update ACE editors
    if (window.ace) {
      let code_block = playpen_block.querySelector('code');
      if (code_block.classList.contains('editable')) {
        let editor = window.ace.edit(code_block);
        editor.addEventListener('change', function(e) {
          update_play_button(playpen_block, playground_crates);
        });
      }
    }
  }

  // updates the visibility of play button based on `no_run` class and
  // used crates vs ones available on http://play.rust-lang.org
  function update_play_button(pre_block, playground_crates) {
    var play_button = pre_block.querySelector('.play-button');

    // skip if code is `no_run`
    if (pre_block.querySelector('code').classList.contains('no_run')) {
      play_button.classList.add('hidden');
      return;
    }

    // get list of `extern crate`'s from snippet
    var txt = playpen_text(pre_block);
    var re = /extern\s+crate\s+([a-zA-Z_0-9]+)\s*;/g;
    var snippet_crates = [];
    var item;
    while ((item = re.exec(txt))) {
      snippet_crates.push(item[1]);
    }

    // check if all used crates are available on play.rust-lang.org
    var all_available = snippet_crates.every(function(elem) {
      return playground_crates.indexOf(elem) > -1;
    });

    if (all_available) {
      play_button.classList.remove('hidden');
    } else {
      play_button.classList.add('hidden');
    }
  }

  function run_rust_code(code_block) {
    var result_block = code_block.querySelector('.result');
    if (!result_block) {
      result_block = document.createElement('code');
      result_block.className = 'result hljs language-bash';

      code_block.append(result_block);
    }

    let text = playpen_text(code_block);
    // Check TODO: Add test Code with user Code
    if (
      text != document.mdBookTextCode &&
      !text.includes(document.mdBookTextCode)
    ) {
      text = remove_default_main(text) + '\n' + document.mdBookTextCode;
    }
    console.log(text);
    var params = {
      channel: 'stable',
      code: text,
      mode: 'debug',
      backtrace: false,
      tests: true,
      crateType: 'lib'
    };

    if (text.indexOf('#![feature') !== -1) {
      params.version = 'nightly';
    }

    result_block.innerText = 'Running...';
    // TODO cargo test
    fetch_with_timeout('https://play.rust-lang.org/execute', {
      headers: {
        // 'Accept': "*/*",
        'Content-Type': 'application/json'
      },

      method: 'POST',
      mode: 'cors',
      body: JSON.stringify(params)
    })
      .then(response => {
        return response.json();
      })
      .then(response => {
        if (response.stdout) {
          result_block.innerText = response.stdout;
        } else {
          result_block.innerText = response.stderr;
        }
      })
      .catch(
        error =>
          (result_block.innerText =
            'Playground Communication: ' + error.message)
      );
  }

  // Syntax highlighting Configuration
  hljs.configure({
    tabReplace: '    ', // 4 spaces
    languages: [] // Languages used for auto-detection
  });

  if (window.ace) {
    // language-rust class needs to be removed for editable
    // blocks or highlightjs will capture events
    Array.from(document.querySelectorAll('code.editable')).forEach(function(
      block
    ) {
      block.classList.remove('language-rust');
    });

    Array.from(document.querySelectorAll('code:not(.editable)')).forEach(
      function(block) {
        hljs.highlightBlock(block);
      }
    );
  } else {
    Array.from(document.querySelectorAll('code')).forEach(function(block) {
      hljs.highlightBlock(block);
    });
  }

  // Adding the hljs class gives code blocks the color css
  // even if highlighting doesn't apply
  Array.from(document.querySelectorAll('code')).forEach(function(block) {
    block.classList.add('hljs');
  });

  Array.from(document.querySelectorAll('code.language-rust')).forEach(function(
    block
  ) {
    var code_block = block;
    var pre_block = block.parentNode;
    // hide lines
    var lines = code_block.innerHTML.split('\n');
    var first_non_hidden_line = false;
    var lines_hidden = false;
    var trimmed_line = '';

    for (var n = 0; n < lines.length; n++) {
      trimmed_line = lines[n].trim();
      if (
        trimmed_line[0] == hiding_character &&
        trimmed_line[1] != hiding_character
      ) {
        if (first_non_hidden_line) {
          lines[n] =
            '<span class="hidden">' +
            '\n' +
            lines[n].replace(/(\s*)# ?/, '$1') +
            '</span>';
        } else {
          lines[n] =
            '<span class="hidden">' +
            lines[n].replace(/(\s*)# ?/, '$1') +
            '\n' +
            '</span>';
        }
        lines_hidden = true;
      } else if (first_non_hidden_line) {
        lines[n] = '\n' + lines[n];
      } else {
        first_non_hidden_line = true;
      }
      if (
        trimmed_line[0] == hiding_character &&
        trimmed_line[1] == hiding_character
      ) {
        lines[n] = lines[n].replace('##', '#');
      }
    }
    code_block.innerHTML = lines.join('');

    // If no lines were hidden, return
    if (!lines_hidden) {
      return;
    }

    var buttons = document.createElement('div');
    buttons.className = 'buttons';
    buttons.innerHTML =
      '<button class="fa fa-expand" title="Show hidden lines" aria-label="Show hidden lines"></button>';

    // add expand button
    pre_block.insertBefore(buttons, pre_block.firstChild);

    pre_block.querySelector('.buttons').addEventListener('click', function(e) {
      if (e.target.classList.contains('fa-expand')) {
        var lines = pre_block.querySelectorAll('span.hidden');

        e.target.classList.remove('fa-expand');
        e.target.classList.add('fa-compress');
        e.target.title = 'Hide lines';
        e.target.setAttribute('aria-label', e.target.title);

        Array.from(lines).forEach(function(line) {
          line.classList.remove('hidden');
          line.classList.add('unhidden');
        });
      } else if (e.target.classList.contains('fa-compress')) {
        var lines = pre_block.querySelectorAll('span.unhidden');

        e.target.classList.remove('fa-compress');
        e.target.classList.add('fa-expand');
        e.target.title = 'Show hidden lines';
        e.target.setAttribute('aria-label', e.target.title);

        Array.from(lines).forEach(function(line) {
          line.classList.remove('unhidden');
          line.classList.add('hidden');
        });
      }
    });
  });

  Array.from(document.querySelectorAll('pre code')).forEach(function(block) {
    var pre_block = block.parentNode;
    if (!pre_block.classList.contains('playpen')) {
      var buttons = pre_block.querySelector('.buttons');
      if (!buttons) {
        buttons = document.createElement('div');
        buttons.className = 'buttons';
        pre_block.insertBefore(buttons, pre_block.firstChild);
      }

      var clipButton = document.createElement('button');
      clipButton.className = 'fa fa-copy clip-button';
      clipButton.title = 'Copy to clipboard';
      clipButton.setAttribute('aria-label', clipButton.title);
      clipButton.innerHTML = '<i class="tooltiptext"></i>';

      buttons.insertBefore(clipButton, buttons.firstChild);
    }
  });

  // Process playpen code blocks
  Array.from(document.querySelectorAll('.playpen')).forEach(function(
    pre_block
  ) {
    // Add global value with test code
    var codewithtest = playpen_text(pre_block);

    if (codewithtest.includes('#[test')) {
      document.mdBookTextCode =
        document.mdBookTextCode || remove_default_main(codewithtest);
    }

    // Add play button
    var buttons = pre_block.querySelector('.buttons');
    if (!buttons) {
      buttons = document.createElement('div');
      buttons.className = 'buttons';
      pre_block.insertBefore(buttons, pre_block.firstChild);
    }

    var runCodeButton = document.createElement('button');
    runCodeButton.className = 'fa fa-play play-button';
    runCodeButton.hidden = true;
    runCodeButton.title = 'Run this code';
    runCodeButton.setAttribute('aria-label', runCodeButton.title);

    var copyCodeClipboardButton = document.createElement('button');
    copyCodeClipboardButton.className = 'fa fa-copy clip-button';
    copyCodeClipboardButton.innerHTML = '<i class="tooltiptext"></i>';
    copyCodeClipboardButton.title = 'Copy to clipboard';
    copyCodeClipboardButton.setAttribute(
      'aria-label',
      copyCodeClipboardButton.title
    );

    buttons.insertBefore(runCodeButton, buttons.firstChild);
    buttons.insertBefore(copyCodeClipboardButton, buttons.firstChild);

    runCodeButton.addEventListener('click', function(e) {
      run_rust_code(pre_block);
    });

    let code_block = pre_block.querySelector('code');
    if (window.ace && code_block.classList.contains('editable')) {
      var undoChangesButton = document.createElement('button');
      undoChangesButton.className = 'fa fa-history reset-button';
      undoChangesButton.title = 'Undo changes';
      undoChangesButton.setAttribute('aria-label', undoChangesButton.title);

      buttons.insertBefore(undoChangesButton, buttons.firstChild);

      undoChangesButton.addEventListener('click', function() {
        let editor = window.ace.edit(code_block);
        editor.setValue(editor.originalCode);
        editor.clearSelection();
      });
    }
  });
})();

(function themes() {
  var html = document.querySelector('html');
  var themeToggleButton = document.getElementById('theme-toggle');
  var themePopup = document.getElementById('theme-list');
  var themeColorMetaTag = document.querySelector('meta[name="theme-color"]');
  var stylesheets = {
    ayuHighlight: document.querySelector("[href$='ayu-highlight.css']"),
    tomorrowNight: document.querySelector("[href$='tomorrow-night.css']"),
    highlight: document.querySelector("[href$='highlight.css']")
  };

  function showThemes() {
    themePopup.style.display = 'block';
    themeToggleButton.setAttribute('aria-expanded', true);
    themePopup.querySelector('button#' + document.body.className).focus();
  }

  function hideThemes() {
    themePopup.style.display = 'none';
    themeToggleButton.setAttribute('aria-expanded', false);
    themeToggleButton.focus();
  }

  function set_theme(theme) {
    let ace_theme;

    if (theme == 'coal' || theme == 'navy') {
      stylesheets.ayuHighlight.disabled = true;
      stylesheets.tomorrowNight.disabled = false;
      stylesheets.highlight.disabled = true;

      ace_theme = 'ace/theme/tomorrow_night';
    } else if (theme == 'ayu') {
      stylesheets.ayuHighlight.disabled = false;
      stylesheets.tomorrowNight.disabled = true;
      stylesheets.highlight.disabled = true;

      ace_theme = 'ace/theme/tomorrow_night';
    } else {
      stylesheets.ayuHighlight.disabled = true;
      stylesheets.tomorrowNight.disabled = true;
      stylesheets.highlight.disabled = false;

      ace_theme = 'ace/theme/dawn';
    }

    setTimeout(function() {
      themeColorMetaTag.content = getComputedStyle(
        document.body
      ).backgroundColor;
    }, 1);

    if (window.ace && window.editors) {
      window.editors.forEach(function(editor) {
        editor.setTheme(ace_theme);
      });
    }

    var previousTheme;
    try {
      previousTheme = localStorage.getItem('mdbook-theme');
    } catch (e) {}
    if (previousTheme === null || previousTheme === undefined) {
      previousTheme = 'light';
    }

    try {
      localStorage.setItem('mdbook-theme', theme);
    } catch (e) {}

    document.body.className = theme;
    html.classList.remove(previousTheme);
    html.classList.add(theme);
  }

  // Set theme
  var theme;
  try {
    theme = localStorage.getItem('mdbook-theme');
  } catch (e) {}
  if (theme === null || theme === undefined) {
    theme = 'light';
  }

  set_theme(theme);

  themeToggleButton.addEventListener('click', function() {
    if (themePopup.style.display === 'block') {
      hideThemes();
    } else {
      showThemes();
    }
  });

  themePopup.addEventListener('click', function(e) {
    var theme = e.target.id || e.target.parentElement.id;
    set_theme(theme);
  });

  themePopup.addEventListener('focusout', function(e) {
    // e.relatedTarget is null in Safari and Firefox on macOS (see workaround below)
    if (
      !!e.relatedTarget &&
      !themeToggleButton.contains(e.relatedTarget) &&
      !themePopup.contains(e.relatedTarget)
    ) {
      hideThemes();
    }
  });

  // Should not be needed, but it works around an issue on macOS & iOS: https://github.com/rust-lang-nursery/mdBook/issues/628
  document.addEventListener('click', function(e) {
    if (
      themePopup.style.display === 'block' &&
      !themeToggleButton.contains(e.target) &&
      !themePopup.contains(e.target)
    ) {
      hideThemes();
    }
  });

  document.addEventListener('keydown', function(e) {
    if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) {
      return;
    }
    if (!themePopup.contains(e.target)) {
      return;
    }

    switch (e.key) {
      case 'Escape':
        e.preventDefault();
        hideThemes();
        break;
      case 'ArrowUp':
        e.preventDefault();
        var li = document.activeElement.parentElement;
        if (li && li.previousElementSibling) {
          li.previousElementSibling.querySelector('button').focus();
        }
        break;
      case 'ArrowDown':
        e.preventDefault();
        var li = document.activeElement.parentElement;
        if (li && li.nextElementSibling) {
          li.nextElementSibling.querySelector('button').focus();
        }
        break;
      case 'Home':
        e.preventDefault();
        themePopup.querySelector('li:first-child button').focus();
        break;
      case 'End':
        e.preventDefault();
        themePopup.querySelector('li:last-child button').focus();
        break;
    }
  });
})();

(function sidebar() {
  var html = document.querySelector('html');
  var sidebar = document.getElementById('sidebar');
  var sidebarLinks = document.querySelectorAll('#sidebar a');
  var sidebarToggleButton = document.getElementById('sidebar-toggle');
  var firstContact = null;

  function showSidebar() {
    html.classList.remove('sidebar-hidden');
    html.classList.add('sidebar-visible');
    Array.from(sidebarLinks).forEach(function(link) {
      link.setAttribute('tabIndex', 0);
    });
    sidebarToggleButton.setAttribute('aria-expanded', true);
    sidebar.setAttribute('aria-hidden', false);
    try {
      localStorage.setItem('mdbook-sidebar', 'visible');
    } catch (e) {}
  }

  function hideSidebar() {
    html.classList.remove('sidebar-visible');
    html.classList.add('sidebar-hidden');
    Array.from(sidebarLinks).forEach(function(link) {
      link.setAttribute('tabIndex', -1);
    });
    sidebarToggleButton.setAttribute('aria-expanded', false);
    sidebar.setAttribute('aria-hidden', true);
    try {
      localStorage.setItem('mdbook-sidebar', 'hidden');
    } catch (e) {}
  }

  // Toggle sidebar
  sidebarToggleButton.addEventListener('click', function sidebarToggle() {
    if (html.classList.contains('sidebar-hidden')) {
      showSidebar();
    } else if (html.classList.contains('sidebar-visible')) {
      hideSidebar();
    } else {
      if (getComputedStyle(sidebar)['transform'] === 'none') {
        hideSidebar();
      } else {
        showSidebar();
      }
    }
  });

  document.addEventListener(
    'touchstart',
    function(e) {
      firstContact = {
        x: e.touches[0].clientX,
        time: Date.now()
      };
    },
    {passive: true}
  );

  document.addEventListener(
    'touchmove',
    function(e) {
      if (!firstContact) return;

      var curX = e.touches[0].clientX;
      var xDiff = curX - firstContact.x,
        tDiff = Date.now() - firstContact.time;

      if (tDiff < 250 && Math.abs(xDiff) >= 150) {
        if (
          xDiff >= 0 &&
          firstContact.x < Math.min(document.body.clientWidth * 0.25, 300)
        )
          showSidebar();
        else if (xDiff < 0 && curX < 300) hideSidebar();

        firstContact = null;
      }
    },
    {passive: true}
  );

  // Scroll sidebar to current active section
  var activeSection = sidebar.querySelector('.active');
  if (activeSection) {
    sidebar.scrollTop = activeSection.offsetTop;
  }
})();

(function chapterNavigation() {
  document.addEventListener('keydown', function(e) {
    if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) {
      return;
    }
    if (window.search && window.search.hasFocus()) {
      return;
    }

    switch (e.key) {
      case 'ArrowRight':
        e.preventDefault();
        var nextButton = document.querySelector('.nav-chapters.next');
        if (nextButton) {
          window.location.href = nextButton.href;
        }
        break;
      case 'ArrowLeft':
        e.preventDefault();
        var previousButton = document.querySelector('.nav-chapters.previous');
        if (previousButton) {
          window.location.href = previousButton.href;
        }
        break;
    }
  });
})();

(function clipboard() {
  var clipButtons = document.querySelectorAll('.clip-button');

  function hideTooltip(elem) {
    elem.firstChild.innerText = '';
    elem.className = 'fa fa-copy clip-button';
  }

  function showTooltip(elem, msg) {
    elem.firstChild.innerText = msg;
    elem.className = 'fa fa-copy tooltipped';
  }

  var clipboardSnippets = new Clipboard('.clip-button', {
    text: function(trigger) {
      hideTooltip(trigger);
      let playpen = trigger.closest('pre');
      return playpen_text(playpen);
    }
  });

  Array.from(clipButtons).forEach(function(clipButton) {
    clipButton.addEventListener('mouseout', function(e) {
      hideTooltip(e.currentTarget);
    });
  });

  clipboardSnippets.on('success', function(e) {
    e.clearSelection();
    showTooltip(e.trigger, 'Copied!');
  });

  clipboardSnippets.on('error', function(e) {
    showTooltip(e.trigger, 'Clipboard error!');
  });
})();

(function scrollToTop() {
  var menuTitle = document.querySelector('.menu-title');

  menuTitle.addEventListener('click', function() {
    document.scrollingElement.scrollTo({top: 0, behavior: 'smooth'});
  });
})();

(function autoHideMenu() {
  var menu = document.getElementById('menu-bar');

  var previousScrollTop = document.scrollingElement.scrollTop;

  document.addEventListener(
    'scroll',
    function() {
      if (
        menu.classList.contains('folded') &&
        document.scrollingElement.scrollTop < previousScrollTop
      ) {
        menu.classList.remove('folded');
      } else if (
        !menu.classList.contains('folded') &&
        document.scrollingElement.scrollTop > previousScrollTop
      ) {
        menu.classList.add('folded');
      }

      if (
        !menu.classList.contains('bordered') &&
        document.scrollingElement.scrollTop > 0
      ) {
        menu.classList.add('bordered');
      }

      if (
        menu.classList.contains('bordered') &&
        document.scrollingElement.scrollTop === 0
      ) {
        menu.classList.remove('bordered');
      }

      previousScrollTop = document.scrollingElement.scrollTop;
    },
    {passive: true}
  );
})();
